Schneeweiss Gerald M, Colwell Alison, Park Jeong-Mi, Jang Chang-Gee, Stuessy Tod F
Department of Higher Plant Systematics and Evolution, Institute of Botany, University of Vienna, Rennweg 14, A-1030 Vienna, Austria.
Mol Phylogenet Evol. 2004 Feb;30(2):465-78. doi: 10.1016/s1055-7903(03)00210-0.
Orobanche is the largest genus among the holoparasitic members of Orobanchaceae. We present the first molecular phylogenetic analysis (using nuclear ITS sequences) that includes members of all sections of Orobanche, Gymnocaulis, Myzorrhiza, Trionychon, and Orobanche. Orobanche is not monophyletic, but falls into two lineages: (1) the Orobanche group comprises Orobanche sect. Orobanche and the small Near Asian genus Diphelypaea and is characterized by a chromosome base number of x=19 and (2) the Phelipanche group contains Orobanche sects. Gymnocaulis, Myzorrhiza, and Trionychon and possesses a chromosome base number of x=12. The relationships between these two groups and to other genera such as Boschniakia or Cistanche remain unresolved. Within the Orobanche group, Orobanche macrolepis and Orobanche anatolica (including Orobanche colorata) constitute two phylogenetically distinct lineages. Intrasectional structurings proposed by some authors for O. sect. Orobanche are not confirmed by the molecular data. In most cases, intraspecific sequence divergence between accessions, if present, is negligible and not correlated with morphological or ecological traits. In a few cases, however, there is evidence for the presence of cryptic taxa.
列当属是列当科全寄生植物成员中最大的属。我们首次进行了分子系统发育分析（使用核糖体DNA内转录间隔区序列），该分析涵盖了列当属所有组、裸茎组、菌根组、刺果组以及列当属的成员。列当属并非单系类群，而是分为两个谱系：（1）列当组包括列当属列当组以及近东小属双盘列当属，其特征是染色体基数x = 19；（2）肉苁蓉组包含列当属的裸茎组、菌根组和刺果组，染色体基数为x = 12。这两个组与其他属（如草苁蓉属或肉苁蓉属）之间的关系仍未明确。在列当组内，大花列当和安纳托利亚列当（包括彩花列当）构成两个系统发育上不同的谱系。一些作者对列当属列当组提出的组内结构划分未得到分子数据的证实。在大多数情况下，各样本间的种内序列差异（若存在）可忽略不计，且与形态或生态特征无关。然而，在少数情况下，有证据表明存在隐存分类单元。
